Increase Ambient Occlusion Effect
This is a basic setup of environment lighting (with lots of AO) in BI:



To bake out the AO, just go to the bake panel and select to bake AO...



Of course, you need to do the usual bake stuff for BI (UV unwrap to a valid texture, etc.).

Here are some links for BI:

How do you bake ambient occlusion for a model?

https://docs.blender.org/manual/en/dev/render/blender_render/bake.html#ambient-occlusion

https://docs.blender.org/manual/en/dev/render/blender_render/world/ambient_occlusion.html

https://docs.blender.org/manual/en/dev/render/blender_render/world/ambient_light.html

And for Cycles:

http://www.blenderguru.com/tutorials/introduction-baking-cycles/

Here is my demo blend file (post all blend files on this site BTW):